/*
sha1.h - header of

============
SHA-1 in C++
============

100% Public Domain.

Original C Code
-- Steve Reid <steve@edmweb.com>
Small changes to fit into bglibs
-- Bruce Guenter <bruce@untroubled.org>
Translation to simpler C++ Code
-- Volker Grabsch <vog@notjusthosting.com>
*/

#ifndef SHA1_HPP
#define SHA1_HPP


#include <iostream>
#include <string>

class SHA1
{
public:
	SHA1();
	void update(const std::string &s);
	void update(std::istream &is);
	std::string final();
	static std::string from_file(const std::string &filename);

private:
	typedef unsigned long int uint32;   /* just needs to be at least 32bit */
	typedef unsigned long long uint64;  /* just needs to be at least 64bit */

	static const unsigned int DIGEST_INTS = 5;  /* number of 32bit integers per SHA1 digest */
	static const unsigned int BLOCK_INTS = 16;  /* number of 32bit integers per SHA1 block */
	static const unsigned int BLOCK_BYTES = BLOCK_INTS * 4;

	uint32 digest[DIGEST_INTS];
	std::string buffer;
	uint64 transforms;

	void reset();
	void transform(uint32 block[BLOCK_BYTES]);

	static void buffer_to_block(const std::string &buffer, uint32 block[BLOCK_BYTES]);
	static void read(std::istream &is, std::string &s, int max);
};

std::string sha1(const std::string &string);



#endif /* SHA1_HPP */